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Effluent from Reactor 2 flows by gravity into a small effluent tank fox sampling and <br />discharge. Treated water is pumped from this tank for use at the plant fox dust suppression <br />during plant decommissioning and final reclamation of the plant site and any unreclaimed <br />mining sites <br />DESIGN FLOW RATE <br />The system is designed to treat up to 100 gallons per minute (gpm) of C-Pit water. Since the <br />process is biological, the treatment rate is expected to be temperature-dependent, so the <br />pumping rate, will need to be reduced during colder months. The system as designed will <br />treat an average of 67 gpm, ox 35 million gallons per year. <br />OPERATIONS <br />After construction of the system, Zenon will inoculate the reactors with bacteria. The <br />pumps will then be started, and acidified C-Pit water with nutrients will be Fed to the <br />reactors. Reactor 2 effluent should be returned to the C-Pit until analytical testing shows <br />that selenium is being removed sufficiently for discharge. Once testing shows that the <br />system is stable and the treatment process is effective, processed water can be used fox dust <br />suppression and site reclamation activities. <br />Normal operation will consist of maintaining sufficient acid and nutrient supplies and <br />checking the~operation of process pumps. Effluent samples should be collected and <br />analyzed periodically for selenium to monitor water quality. <br />With pumping, treatment, and discharge, the water volume and surface area in C-Pit will <br />decrease to some small residual amount, beyond which it will become impossible to continue <br />pumping. At that point, the treatment system will be removed from the site, and sufficient <br />porous fill material will be placed in C-Pit to eliminate a free water surface. For the purpose <br />of cost estimating, the volume of imported fill material has been assumed at 2,000 cubic <br />yards (5 feet deep over one-quarter acre). The placement of this fill is the final element in <br />the treatment process required by TR-07. Final reclamation of C-Pit and the plant site are <br />covered by other requirements and bonding under CEMEX's permit with DMG. <br />